Process for producing a diaryl carnonate

Details Process for producing a diaryl carnonate Process for producing a diaryl carnonate

1997-12-11

1998-09-22

Ambrose, Michael G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C07C 6936

Patent

active

058115730

ABSTRACT:
A diaryl carbonate with a high degree of purity is produced at a high yield by (A) subjecting (a) a diaryl oxalate and a phenol compound or (b) an alkylaryl oxalate to transesterification reaction in one or two stages in the presence of a catalyst to prepare a diaryl oxalate, while removing a by-product from the reaction system; (B) collecting the diaryl oxalate from the resultant reaction product mixture of the step (A); (C) subjecting the diaryl oxalate to a decarbonylation reaction, preferably in the presence of a phosphorous compound-containing catalyst, to convert the diaryl oxalate to a corresponding diaryl carbonate, while removing a reaction by-product comprising carbon monoxide from the reaction system; and (D) collecting the diaryl carbonate from the reaction product mixture of the step (C).

REFERENCES:
patent: 3471549 (1969-10-01), Hulsmann et al.
patent: 3476785 (1969-11-01), Huelsmann et al.
patent: 3704309 (1972-11-01), Roy
patent: 4234733 (1980-11-01), Isshiki et al.
patent: 4451664 (1984-05-01), Ranade
patent: 4482732 (1984-11-01), Ranade
patent: 4482733 (1984-11-01), Ranade

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